=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?

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=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?=if(A"","1",

=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?
=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?

=if(A"","1","").如何实现该公式下拉时,"1"中的数字1也增加1或增加n?
B1输入公式：
=IF(A1"",COUNTA(A$1:A1),"")
下拉复制